title: Electrochemical behavior and determination of rutin on a pyridinium-based ionic liquid modified carbon paste electrode.
abstract: In this paper the electrochemical behavior of rutin on a pyridinium-typed ionic liquid modified carbon paste electrode (IL-CPE) was investigated and further used for rutin sample determination. The IL-CPE showed strong electrocatalytic effects to the oxidation of rutin. In phosphate buffer solution (PBS, pH 2.5; 0.1 M) a pair of well-defined cyclic voltammetric redox peaks of rutin appeared with the redox peak located at 512mV (Epa) and 448mV (Epc) (vs. SCE), respectively. The redox peak current was increased about 27.5 times more than that on traditional carbon paste electrode (CPE). The electrochemical parameters of rutin on the IL-CPE were calculated with the results of the charge transfer coefficient (alpha), the number of electron transfer (n) and the electrode reaction rate constant (k(s)) as 0.53, 1.80 and 2.39s(-1), respectively. The cathodic peak currents increased linearly with the concentration of rutin in the range from 5.0x10(-7) to 1.0x10(-4)M with the detection limit as 3.58x10(-7)M (3sigma). The relative standard deviation (RSD) of 10 successive detection of 5.0x10(-5)M rutin was 4.2%. The method was successfully applied to the determination of rutin content in tablets samples with good recovery. The modified electrode showed good stability and reproducibility without the influence of the coexisting substances.
authors.affiliation: Key Laboratory of Eco-Chemical Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. sunwei@qust.edu.cn
authors.forename: Wei
authors.initials: W
authors.lastname: Sun
authors.forename: Maoxia
authors.initials: M
authors.lastname: Yang
authors.forename: Yinzhuo
authors.initials: Y
authors.lastname: Li
authors.forename: Qiang
authors.initials: Q
authors.lastname: Jiang
authors.forename: Shufeng
authors.initials: S
authors.lastname: Liu
authors.forename: Kui
authors.initials: K
authors.lastname: Jiao
mesh_terms: D002021:Buffers; D002244:Carbon / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D052578:Ionic Liquids / Q000737:chemistry*; D015394:Molecular Structure; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D010710:Phosphates / Q000737:chemistry; D011726:Pyridinium Compounds / Q000737:chemistry*; D015203:Reproducibility of Results; D012431:Rutin / Q000032:analysis* / Q000737:chemistry; D013607:Tablets; D013696:Temperature
chemical_list: D002021:Buffers; D052578:Ionic Liquids; D010710:Phosphates; D011726:Pyridinium Compounds; D013607:Tablets; D012431:Rutin; D002244:Carbon; D009584:Nitrogen